The India Meteorological Department (IMD) has issued a yellow alert for thunderstorms with lightning accompanied by rain in almost all the districts of West Bengal from Sunday. Additionally, West Midnapore and West Burdwan have been alerted for a heatwave on Sunday.

The IMD issued orange alerts for rain, thunderstorms, lightning, and gusty winds of 40-50 kmph expected at one or two locations in Nadia, Murshidabad, Birbhum, and East Burdwan on Monday.

Kolkata recorded 37.4 degrees Celsius during the daytime, with the maximum humidity at 83 per cent on Saturday. The sky remained partly cloudy, with the possibility of rain or thunderstorms toward night.

In the other parts of southern Bengal, on Saturday, the maximum temperature in Kalaikunda was 42.2 degrees Celsius, Panaghar and Asansol recorded 41.5 degrees Celsius, and Purulia and Barrackpore recorded 40 degrees Celsius.

On the northern side, light to moderate rain with thunderstorms and gusty winds reaching 40-50 kmph remained constant and are likely to continue this week in the districts of Darjeeling, Jalpaiguri, Kalimpong, Alipurduar, Coochbehar, South Dinajpur, North Dinajpur, and Malda.

Heavy rain (7-11 cm) is likely to occur at one or two places in Darjeeling, Jalpaiguri, Kalimpong, Alipurduar, and Cooch Behar on Sunday.

The maximum temperature at Darjeeling on Saturday was 24.4 degrees Celsius, which is gradually rising. Coochbehar and Jalpaiguri were at 38 Degrees Celsius, Alipurduar was at 37 Degrees Celsius, and Balurghat recorded 41.4 degrees Celsius.